Giant rock crabs are massive versions of the weaker Rock crab. They lie in wait for prey, disguised as large boulders. When approached, they attack, unless they have become tolerant, in which case they remain as "boulders" - attempting to cast a spell on them gives the message "You can't attack this NPC."

Giant rock crabs are only initially aggressive if they are approached while dormant. Once they are moving and the targeted player is out of range, they stop being aggressive and will ignore players that don't attack them. They eventually become dormant boulders again after a while if they are not attacked.



The giant rock crab is one of few monsters in RuneScape that will retreat from battle when they become critically wounded. This can be troublesome, as they are found in a single-way combat area. This can be prevented by attacking them while their back is turned to a nearby wall, so that they move away from the player and back up into the wall. If they move too far away, the player will follow them and risk being attacked by another rock crab. There are several protruding sections of the walls in the area that can be used as safespots which are ideal as the crabs' main weakness is magic.



Item Quantity Rarity GE market price
Bones Bones 1 Always 49


Item Quantity Rarity GE market price
Water rune Water rune 1–39 Uncommon 5–195
Earth rune Earth rune 2–37 Uncommon 10–185
Air talisman Air talisman 1 Rare 74
Mind talisman Mind talisman 1 Rare 4,591
Fire talisman Fire talisman 1 Rare 4,491
Cosmic talisman Cosmic talisman 1 Rare 756
Body talisman Body talisman 1 Rare 769
Water talisman Water talisman 1 Rare 158
Earth talisman Earth talisman 1 Rare 295


Item Quantity Rarity GE market price
Steel platebody Steel platebody 1 Uncommon 880
Black claws Black claws 1 Uncommon 362
Black platebody Black platebody 1 Uncommon 3,463
Mithril axe Mithril axe 1 Uncommon 123
Rock-shell gloves Rock-shell gloves 1 Uncommon 401
Rock-shell boots Rock-shell boots 1 Uncommon 539
Black warhammer Black warhammer 1 Rare 349
Adamant longsword Adamant longsword 1 Rare 1,637
Adamant warhammer Adamant warhammer 1 Rare 2,345


Item Quantity Rarity GE market price
Poison ivy seed 5 Poison ivy seed 1 Uncommon 23
Belladonna seed 5 Belladonna seed 1 Uncommon 28
Herb seed 5 Guam seed 1 Uncommon 16
Herb seed 5 Marrentill seed 1 Uncommon 10
Herb seed 5 Tarromin seed 1 Uncommon 12
Herb seed 5 Harralander seed 1 Uncommon 24
Herb seed 5 Toadflax seed 1 Rare 1,040
Herb seed 5 Ranarr seed 1 Rare 50,437
Herb seed 5 Irit seed 1 Rare 48
Herb seed 5 Avantoe seed 1 Rare 1,562
Herb seed 5 Snapdragon seed 1 Rare 65,631
Herb seed 5 Cadantine seed 1 Rare 1,303
Herb seed 5 Lantadyme seed 1 Rare 2,255
Herb seed 5 Dwarf weed seed 1 Very rare 736
Herb seed 5 Torstol seed 1 Very rare 55,205


Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Uncommon 14
Grimy marrentill Grimy marrentill 1 Uncommon 15
Grimy tarromin Grimy tarromin 1 Uncommon 154
Grimy harralander Grimy harralander 1 Uncommon 644
Grimy ranarr weed Grimy ranarr weed 1 Rare 8,076
Grimy irit leaf Grimy irit leaf 1 Rare 853
Grimy avantoe Grimy avantoe 1 Rare 1,936
Grimy kwuarm Grimy kwuarm 1 Rare 1,246
Grimy cadantine Grimy cadantine 1 Rare 1,575
Grimy lantadyme Grimy lantadyme 1 Rare 1,431
Grimy dwarf weed Grimy dwarf weed 1 Rare 571


Item Quantity Rarity GE market price
Coins 100 Coins 27; 28; 42; 70; 137 Common Not sold
Raw lobster Raw lobster 1 Common 120
Raw bass Raw bass 1 Common 345
Tinderbox Tinderbox 1 Common 53
Rock-shell splinter Rock-shell splinter 1 Uncommon (1/64) 20,943
Rock-shell chunk Rock-shell chunk 1 Uncommon (1/64) 10,449
Rock-shell shard Rock-shell shard 1 Uncommon (1/64) 17,627
Casket Casket 1 Rare 677
Clue scroll (medium) Clue scroll (medium) 1 Very rare Not sold

Gem drop table

In addition to the drops above, this monster has access to the gem drop table.

Show/hide gem drop table
Item Quantity Rarity GE market price
Uncut sapphire Uncut sapphire 1 Rare 511
Uncut emerald Uncut emerald 1 Rare 688
Uncut ruby Uncut ruby 1 Rare 1,342
Nature talisman Nature talisman 1 Very rare 782
Uncut diamond Uncut diamond 1 Very rare 2,811
Rune javelin Rune javelin 5 Very rare 875
Loop half of key Loop half of key 1 Very rare 10,582
Tooth half of key Tooth half of key 1 Very rare 9,085
Rune spear Rune spear 1 Very rare 11,935
Shield left half Shield left half 1 Very rare 65,091
Dragon spear Dragon spear 1 Very rare 37,903
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